Outer Limits 4x4 Board

I have a MQ swb with modified wheel base and suspension height, I had to get a tailshaft shortened to fit, so I got a tailshaft with a double cardinal joint to allow for the lift and wheel base, but I don't know if the driveshaft end with the double cardinal joint has to bolt to a specific end i.e g/box or diff?
does it even matter?

The double cardan has to go to the transfer case

thank's heaps for a quick response, do you know why?

that is the end with the most angle but you will have to adjust the pinion angle so it is in line with the driveshaft you can do this by fitting castor wedges between diff and leaf springs